Sun Java System Messaging Server 6.3 Administration Guide

26.3.1 TLS Problems

If, during SMTP dialog, the STARTTLS command returns the following error:

454 4.7.1 TLS library initialization failure

and if you have certificates installed and working for pop/imap access, check the following:

After changing protections and installing certificates, you must run:

stop-msg dispatcher 
start-msg dispatcher

Restarting should work, but it is better to shut it down completely, install the certificates, and then start things back up.